I’ve decided to document what little knowledge I have on using Regular Expressions in C#. Nothing grand, just a list of formats, special characters and usage.
Control Characters:
| Character | Matches |
|---|---|
| . | Any character but the newline (\n) |
| $ | Characters at the end of a string |
| ^ | Characters at the beginning of a string. Also used in conjunction with ‘[]‘ to specify “not.” |
| + | One or more of the specified characters |
| * | Zero or more of the specified characters |
| ? | Zero or One of the specified characters |
| \ | Used to escape special characters as well as signify special character sets |
| ( ) | Used to specify a collection of characters to match |
| [ ] | Used to specify a set of single characters or ranges to match |
| { } | Used to specify how many times to match a given character(s) |
| | | Used as a logical OR. Allows one or more expressions to be selected for a match |
Special Character Sets:
| Character | Matches |
|---|---|
| \w | Any word character. Same as [A-Za-z0-9_] |
| \W | Any non-word character. Same as [^A-Za-z0-9_] |
| \s | Any whitespace character. Same as [ \t\v] |
| \S | Any non-whitespace character. Same as [^ \t\v] |
| \d | Any digit. Same as [0-9] |
| \D | Any non digit. Same as [^0-9] |
Escaped Characters:
| Character | Matches |
|---|---|
| \t | Horizontal Tab |
| \r | Carriage Return |
| \n | New Line |
| \b | Backspace |
| \x5C | An ASCII character in 2-digit hexadecimal |
| \u4B52 | A Unicode character in 4-digit hexadecimal |